I genuinely though we were gonna get this with Big Mom with when they fought her on the ocean back at the end of WCI, then with her falling into the ocean early Wano and then her falling off Onigashima towards the ocean. Given how "indestructible" she seems to be, how unstoppable she is, it would be a great way to get rid of her once and for all.
Now Luffy is also falling into the ocean again like he did in the beginning of Wano, but he's gonna be fine somehow of course, plot armour/being the MC will save him regardless.
We also had Jack, but thankfully he didn't die due to being a fishman apparently, his character would have been seriously wasted if he died that easily and quickly. It's not a lot better right now but there's still a vain hope Jack might just get some love by Oda sooner or later, very vain hope at this point.
I do always enjoy the idea of Blackbeard being the one to drown and die though. The guy who "cheated" the rule of not being to eat more than 1 DF somehow, the great "Teach the Cheat" himself. Either the 2 DF is a rule is a lie by the WG or BB's abnormal body that Marco mentioned and that Zoro and Luffy seemed to notice back at Jaya is the reason ofc.
It's much more likely the latter.
Given how BB and his crew fixate on DFs so much and BB is trying to use multiple DFs, imagine if having more DFs makes him more ironically vulnerable to the ocean? A pirate who also wants to be the Pirate King and is a Pirate Emperor and Admiral of his own Pirate Fleet being increasingly more vulnerable and afraid of the ocean would be hilariously ironic and poetic. A pirate forced to stay on land more and more and has to avoid sailing for increased risk of drowning?
It kinda reminds me of how Captain Hook was terrified of the crocodile trying to finish him off, to eat the rest of him?
We are gonna see someone with a DF drown and die and it's gonna be extremely haunting too. I've even toyed with the idea of it happening to Akainu somehow, him dying and drowing in a desperate fit of rage and helplessness.